Lockdown Screw Packing Seal PR2 Test For Wellhead Seal

Lockdown screw packing seal PR2 Test for wellhead seal

August 11. 2023

Lockdown Screw packing seal is usually made of an HBNR compression packing element with molded metal end caps. But JST has developed a lockdown screw packing seal which is made of one filled PTFE and two cooper end caps.

It is the sealing between wellhead members in a wellhead, including a seal element and a lockdown member. The seal is attachable to either one of the wellhead members by coupling the lockdown member to a locking surface on the wellhead member.

The lockdown surface may include corresponding profiles for mating engagement to preventing relative movement between the wellhead member and seal assembly.

JST's Lockdown screw packing seal passed PR2 test.

Test condition：

1) Product PN： ESD0015ZP2G01

2) Dimension: 1.51"X1.12"X1.5"

3) Material： PE001(PTFE)+T1 (Contains over 99% copper)

4) Temperature： -60℃~177℃ ( -76℉~350℉)

5) Pressure： 15000psi

6) Gas Test Medium： N2

7) Sealing Type： Static seal

8) Shell test pressure: 22500psi

9) Test Medium for Shell test: Water

10) Rated torque: Verify the torque value of 590 ft-lbs/800N.M for Lockdown screw body and the stuffing box nut

1. Fixture picture after testing

2. Product picture after testing (Require that the product has no axial or radial penetrating cracks)

1.51 Inch LDS Seal (ESD) PR2 Test Data

No.	Test Name	Port	Temp(℃)	Pressure (Psi)	Medium	Pressure Holding Time(S)	Pressure drops(Psi)	Conclusion
1	Monitor O-ring sealing performance of Port C	A	Ambient Temp	100	N2	900	2	Passed
2	Shell test	A	Ambient Temp	22500	N2	900	35	Passed
3	Pressure test at maximum rated temp	A	177	15000	N2	3600	37	Passed
4	Pressure test at minimum rated temp	A	-60	15000	N2	3600	42	Passed
5	Temp and pressure cycle test Port A	A	Ambient Temp	7500-15000	N2	/	/	Passed
			177	15000	N2	3600	40	Passed
			-60	15000	N2	3600	35	Passed
			Ambient Temp	7500-15000	N2	3600	/	Passed
6	Pressure test at maximum rated temp	A	177	15000	N2	3600	59	Passed
7	Pressure test at minimum rated temp	A	-60	15000	N2	3600	35	Passed
8	Maximum rated pressure test	A	Ambient Temp	15000	N2	3600	14	Passed
9	Minimum rated pressure test	A	Ambient Temp	750-1000	N2	3600	8	Passed

Conclusion：

1.51" LDS (Lockdown Screw Seal) packing PN. ESD0015ZP2G01 passed the Pre-qualification testing per API 6A PSL 3G.

(PSL 3G will include a shell test pressure of 22.5Ksi for 15K working pressure rated products.), Pressure temperature cycle test as per API 6A 21st Edition Annex F PR2F table F.18 and Torque test as per customer’s requirement; (Torque value test is required before PR2F and after PR2F) at temperature K-X(-60℃~177℃ ( -76℉~350℉)) and working pressure of 15,000 psi with gas as test medium.

The test data can be found in the above testing procedure, which meets the testing acceptance standards.

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